src/utility-types.ts

   1 import type { Worker as ClusterWorker } from 'cluster'
   2 import type { MessagePort } from 'worker_threads'
   3 import type { AbstractPoolWorker } from './pools/abstract-pool-worker'
   4 import type { KillBehavior } from './worker/worker-options'
   5
   6 /**
   7  * Make all properties in T non-readonly.
   8  */
   9 export type Draft<T> = { -readonly [P in keyof T]?: T[P] }
  10
  11 /**
  12  * Message object that is passed between worker and main worker.
  13  */
  14 export interface MessageValue<
  15   Data = unknown,
  16   MainWorker extends ClusterWorker | MessagePort | unknown = unknown
  17 > {
  18   /**
  19    * Input data that will be passed to the worker.
  20    */
  21   readonly data?: Data
  22   /**
  23    * Id of the message.
  24    */
  25   readonly id?: number
  26   /**
  27    * Kill code.
  28    */
  29   readonly kill?: KillBehavior | 1
  30   /**
  31    * Error.
  32    */
  33   readonly error?: string
  34   /**
  35    * Reference to main worker.
  36    *
  37    * Only for internal use.
  38    */
  39   readonly parent?: MainWorker
  40 }
  41
  42 /**
  43  * An object holding the worker that will be used to resolve/rejects the promise later on.
  44  *
  45  * @template Worker Type of worker.
  46  * @template Response Type of response of execution. This can only be serializable data.
  47  */
  48 export interface PromiseWorkerResponseWrapper<
  49   Worker extends AbstractPoolWorker,
  50   Response = unknown
  51 > {
  52   /**
  53    * Resolve callback to fulfill the promise.
  54    */
  55   readonly resolve: (value: Response) => void
  56   /**
  57    * Reject callback to reject the promise.
  58    */
  59   readonly reject: (reason?: string) => void
  60   /**
  61    * The worker that has the assigned task.
  62    */
  63   readonly worker: Worker
  64 }